Remove the need to call chain on _(…) wrapped values.

Former-commit-id: 21861c88e3ec9af955d844c025b50cb32c322809

build/pre-compile.js

@@ -59,7 +59,6 @@
   /** Used to protect the specified properties from getting minified */
   var propWhitelist = [
     '_',
-    '__chain__',
     '__wrapped__',
     'after',
     'all',
@@ -190,6 +189,9 @@
     'wrap',
     'zip',
 
+    // property used by the `lodash underscore` build
+    '__chain__',
+
     // properties used by underscore.js
     '_chain',
     '_wrapped'